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The best solution for an eco-house: Unique properties of clay with sawdust

With the help of this mixture, living rooms and unheated outbuildings, cellars and basements that require improved thermal insulation are insulated.

Solutions for the construction and insulation of residential and auxiliary premises, which include clay, have proven to be excellent. The mass of clay and sawdust is widely known.

Clay with sawdust

  • Properties and uses of clay
  • Sawdust processing
  • Clay preparation

    • Removable formwork
    • Installation of plates
    • Fixing the insulation with a lattice of bars
  • Ceiling insulation
  • Comparative characteristics of clay with sawdust as a heater with polymer analogues
  • Can I buy ready-made clay and sawdust insulation?

With its help, living rooms and unheated buildings in yards are insulated, for example, for keeping livestock in winter, cellars and basements – any premises that require improved thermal insulation.

This composition is mainly used for insulation of walls and ceilings. It is quite simple to manufacture and use, its components are available and inexpensive. Thanks to the fashion for eco-houses, clay insulation is still relevant today.

Properties and uses of clay

The modern building materials market offers a wide range of means to improve the thermal insulation performance of premises. Next, we will consider whether the clay-sawdust mass is inferior to them in its parameters.

The best solution for an eco-house: Unique properties of clay with sawdust

The undeniable advantage is the low cost: often all the ingredients are obtained for free. Further maintenance and, if necessary, minor repairs of adobe pavements also do not require special costs.

The disadvantages of the material most often include labor intensity: in order for a mixture of clay and sawdust to become a heater, it must be subjected to a number of manipulations.

Sawdust processing

In order for a homemade heat insulator to meet standards, the first step is to prepare sawdust. They should be cleaned of any impurities (sieved, washed and dried), if any.

The best solution for an eco-house: Unique properties of clay with sawdust

Next, it is necessary to impregnate the sawdust with special means in order to increase their refractory qualities and protect them from decay processes and pests.

As you know, each type of wood has its own characteristics. Oak sawdust has increased resistance to bacteria and is practically not subject to decay, their size and density do not change under the influence of moisture.

Softwood sawdust contains a large percentage of essential oils – a natural antiseptic that protects walls from mold.

Clay preparation

Preparation is also desirable for clay. The ideal component is clay, filled with water for the winter and thawed in the spring. The type of clay is also important, it is determined by the geographic location of production and a number of criteria.

The main one is fat content: breeds are divided into “fat” and “skinny”. The higher the fat content, the better the plasticity characteristics. At the same time, when drying, fatty rocks give significant shrinkage, as a result of which characteristic cracks can form on the surface.

Attention! If you have to deal with “oily” clay, sand must be added to the mixture.

A very important point is the observance of proportions so that the insulation retains its strength for a long time. Its main components are:

  • clay;
  • sawdust;
  • water;
  • sand.

The weather outside the window also matters. A warm sunny day is most favorable for work, so that the mass has time to dry out.

Technological solutions are the key to successful results and the quality of the heat insulator. You will need:

  • concrete mixer;
  • buckets;
  • two barrels: for kneading and the resulting mixture.

In one of the barrels, the clay is soaked for several hours. By stirring it periodically, you will see when the mass becomes homogeneous. Using a bucket, pour some into a concrete mixer, add sawdust in a ratio of 1 bucket of clay to 2/3 of a bucket of sawdust.

Sometimes technical salt is added to the composition to improve the thermal insulation qualities, which is especially important in cold latitudes.

Attention! When technical salt is added to the composition, the proportional ratio of clay and sawdust changes: 1: 1 – a bucket of clay for a bucket of sawdust.

Transfer the resulting mixture to a second barrel or other container of sufficient size. The finished insulation is to be installed.

The most common are the following installation methods:

  • removable formwork;
  • installation of plates;
  • fixing the insulation with a lattice of bars;
  • design features as formwork for ceiling insulation.

Removable formwork

Formwork is being built from the boards knocked down by nails. The mixture fills the space between the formwork and the insulated surface, when it hardens to the ability to maintain strength on its own, the formwork is removed.

Installation of plates

Another method is quite popular: forms in the form of slabs or bricks are made from boards, the mixture in them dries up and in this form is mounted on a warmed surface.

This method is especially relevant in rooms where repair work has already been completed, as it minimizes pollution. The slabs are fixed to the surface end-to-end, the joints and gaps between them are processed with the remains of the clay mixture.

Fixing the insulation with a lattice of bars

Bars are packed on the surface to be insulated in such a way that a lattice with square or diamond-shaped cells of about 300 x 300 mm and at least 100 mm deep is formed from them.

If necessary, a plywood sheet is pre-attached for fixing the grille, if required by the surface features. The cells are filled with the prepared solution.

Attention! It is not recommended to dry the insulated clay structure in direct sunlight. The room should be shaded while drying.

Ceiling insulation

Cardboard or glassine is spread over the entire area. The clay-sawdust mass is applied to it in thin layers, the next layer is added after the previous one has partially dried.

When the thickness reaches 10-12 cm, the work can be considered completed. In summer and auxiliary non-residential premises, a five-centimeter thick insulation is sufficient. Make sure there are no microcracks.

The best solution for an eco-house: Unique properties of clay with sawdust

The design of some houses is such that no formwork is required to insulate the ceiling: its functions are performed by closely spaced ceiling beams. In this case, the voids between them are filled with clay and sawdust.

For the formation and installation of insulation, you should have at hand:

  • boards in the required quantity;
  • nails and hammer;
  • putty knife;
  • tape or stapler;
  • waterproofing film;
  • cardboard (used in ceiling insulation).

Comparative characteristics of clay with sawdust as a heater with polymer analogues

Molding refractory clays comply with GOST 3226-93, adopted in 01.01.1995. This GOST includes parameters such as compression density, chemical composition, compliance with the rules of packaging, storage and transportation.

The best solution for an eco-house: Unique properties of clay with sawdust

The environmental friendliness of expanded polystyrene and polystyrene leaves much to be desired, moreover, this group of heat insulators is extremely flammable. It should be remembered that sawdust in its pure form, not treated with anti-ignition agents, is also a fire hazardous material.

Clay partly reduces the likelihood of ignition and fire spread. Nevertheless, if power cables are laid near the insulation, you should take care of their serviceability and the quality of insulation in advance. Thermal insulation of the chimney pipes is also recommended.

Non-combustible materials include mineral wool, mineral slabs and fiberglass, but they differ in the peculiarity of forming dust when drying, their coefficient of thermal conductivity on average does not exceed 0.42, which is half the same indicator of the clay-sawdust mixture.

In terms of density, clay is a rather weighty material. To achieve the desired thermal conductivity, a thick layer is required. Before starting work, you should make sure that such a load will be feasible for the supporting structure.

Clay is one of the best sound insulators, more than twice surpassing mineral wool-based insulation by this criterion.

Experience shows that when insulating with synthetic polymers, the costs are not limited to the purchase of the material. Condensation is one of the “side effects” of modern heat insulators.

In order to maintain an optimal microclimate in the room, a vapor barrier layer is required, respectively, additional purchase and installation work. The choice in favor of a home-made insulation made of clay-sawdust mass can significantly simplify the thermal insulation structure and achieve the desired level of humidity in the room.

The advantages of synthetic insulation include ease of installation of some of them, high moisture resistance.

Polymers are initially not susceptible to decay, therefore they do not require additional processing, their field of application has no restrictions, while insulation made from a mixture of clay and sawdust is intended for internal walls and needs waterproofing: when wet, the thermal insulation indicators decrease significantly, at the same time after drying, the former properties are restored.

Can I buy ready-made clay and sawdust insulation?

Buying ready-made clay insulation is not an easy task. Apparently, the reason for this is the low price. Most construction manufacturing firms prefer to deal with more cost-effective materials.

In addition, this is not the most demanded product: often you can get clay and waste from the woodworking industry, which in essence are sawdust, is completely free.

Subject to the above conditions, a thermal insulator made of clay and sawdust is an effective, economical and environmentally friendly solution to insulate walls and ceilings. published by econet.ru

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PS And remember, just by changing your consumption – together we are changing the world! © econet

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